Armband tensioner/shortener
thingiverse
This is a tensioner/splitter for phone sports armbands, but it should work with any strap since the dimensions are adjustable settings within Onshape. The goal is to be able to play Just Dance Now while wearing my phone on my wrist. The STL is designed to shorten a 55 mm wide, approximately 2.5 mm thick strap by about 2 cm. Print as instructed, no supports required. To enhance the XY strength, I set infill to 50%, Rectilinear. Browser userscript for selecting a random song and searching within Just Dance Now: https://github.com/thomasa88/justdance-utils/blob/master/README.md
With this file you will be able to print Armband tensioner/shortener with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Armband tensioner/shortener.